CVE-2026-34120Disclosure(tp-link / tapo_c520ws)

TP-Link Tapo C520WS に複数の深刻な脆弱性：DoS 攻撃とシステム・クラッシュの恐れ https://iototsecnews.jp/2026/04/03/multiple-tp-link-vulnerabilities-let-attackers-trigger-dos-and-crash-routers/ これらの脆弱性の主な原因は、ネットワークからのリクエストを受け取る際の、処理の不備にあります。特に CVE-2026-34121 では、JSON リクエストを解析する際の認証ロジックに問題があり、必要な手順がバイパスされてしまう状況にあります。また、CVE-2026-34118／CVE-2026-34119／CVE-2026-34120／CVE-2026-34122／CVE-2026-34124 では、データの長さやパスの変換を正しく計算／検証できていないために、バッファ・オーバーフローによるメモリ破壊とカメラの停止が引き起こされます。ご利用のチームは、ご注意ください。 #CVE202634118 #CVE202634119 #CVE202634120 #CVE202634121 #CVE202634122 #CVE202634124 #TapoC520WS #TPLink #Vulnerability

⚠️ **Vulnerability Alert:** Multiple vulnerabilities in TP-Link Tapo C520WS cameras (DoS and authentication bypass) 📅 **Timeline:** Disclosure: 2026-04-02; Patch available (see vendor release notes) 🆔 **CVE-2026-34121** | 📊 CVSS: 8.7 (HIGH 🟠) | 📈 EPSS: Not Available% 🆔 **CVE-2026-34118** | 📊 CVSS: 7.1 (HIGH 🟠) | 📈 EPSS: Not Available% 🆔 **CVE-2026-34119** | 📊 CVSS: 7.1 (HIGH 🟠) | 📈 EPSS: Not Available% 🆔 **CVE-2026-34120** | 📊 CVSS: 7.1 (HIGH 🟠) | 📈 EPSS: Not Available% 🆔 **CVE-2026-34122** | 📊 CVSS: 7.1 (HIGH 🟠) | 📈 EPSS: Not Available% 🆔 **CVE-2026-34124** | 📊 CVSS: 7.1 (HIGH 🟠) | 📈 EPSS: Not Available% 🛠️ **Exploit Maturity:** Not Available 📂 **Affected Versions:** Tapo C520WS v2.6 (firmware before 1.2.4 Build 260326 Rel. 24666n) 🔧 **Fixed Versions:** 1.2.4 Build 260326 Rel. 24666n 🫨 **Attack Vectors:** - Adjacent network (same local network segment) 📝 **Summary:** Multiple high‑severity flaws allow unauthenticated attackers on the local network to crash Tapo C520WS devices (DoS) and bypass authentication to modify settings or access functionality, creating outages and privacy risks. Immediate firmware updates and network controls are required to prevent device unavailability and unauthorized configuration changes. 📈 **Impact Scope:** Devices may crash or reboot, lose streaming/monitoring capability, or have configuration/state modified by unauthenticated actors — causing blind spots and privacy exposure. 🛡️ **Recommended Actions:** - Apply TP-Link firmware update to 1.2.4 Build 260326 Rel. 24666n (or later) immediately. - Segment cameras onto a separate VLAN and restrict inter-segment access. - Disable remote administration and unnecessary services; rotate local/admin credentials. - Monitor device logs for crashes, unexpected reboots, or config changes; apply network controls (ARP inspection, MAC filtering). 🪢 **Related Resources:** - https://www.tp-link.com/en/support/download/tapo-c520ws/#Firmware-Release-Notes - https://nvd.nist.gov/vuln/detail/CVE-2026-34121 🏷 **Tags:** #Cybersecurity #IoT #TPLink

⚠️ **Vulnerability Alert:** Multiple Buffer Overflow and Auth Bypass Vulnerabilities in TP-Link Tapo C520WS (CVE-2026-34118 through CVE-2026-34124) 📅 **Timeline:** Disclosure: 2026-04-02; Patch: Not stated 🆔 **CVE-2026-34118** | 📊 CVSS: 7.1 (HIGH 🟠) 🆔 **CVE-2026-34119** | 📊 CVSS: 7.1 (HIGH 🟠) 🆔 **CVE-2026-34120** | 📊 CVSS: 7.1 (HIGH 🟠) 🆔 **CVE-2026-34121** | 📊 CVSS: 8.7 (HIGH 🟠) 🆔 **CVE-2026-34122** | 📊 CVSS: 7.1 (HIGH 🟠) 🆔 **CVE-2026-34123** 🆔 **CVE-2026-34124** | 📊 CVSS: 7.1 (HIGH 🟠) 🛠️ **Exploit Maturity:** Not Available 🔧 **Fixed Versions:** Patched by TP-Link (vendor firmware update; specific fixed version not stated) 🫨 **Attack Vectors:** - Adjacent network (same network segment) — crafted HTTP requests - Unauthenticated HTTP request / authorization bypass (CVE-2026-34121) - Streaming/local video request parsing vectors 📝 **Summary:** Multiple heap- and stack-based buffer overflows in Tapo C520WS allow adjacent-network attackers to trigger crashes/DoS and potentially escalate to remote code execution depending on exploitability. Separately, CVE-2026-34121 is an unauthenticated authorization bypass that permits unauthorized configuration changes. 📈 **Impact Scope:** Widely deployed Tapo C520WS devices in homes and businesses — risks include device outages, unauthorized configuration changes, privacy exposure, and potential lateral compromise if memory-corruption flaws are weaponized. 🛡️ **Recommended Actions:** - Apply the TP-Link firmware update immediately when available and verify device versions - Isolate cameras on a dedicated VLAN and restrict HTTP/management access - Block or limit HTTP access from untrusted networks and the internet - Monitor device logs and network traffic for abnormal HTTP requests and repeated crashes - Maintain an inventory of affected devices and consider temporary removal from sensitive networks if you cannot patch 🪢 **Related Resources:** - https://www.tp-link.com/en/support/download/tapo-c520ws/#Firmware-Release-Notes - https://cyberpress.org/critical-tp-link/ 🏷 **Tags:** #Cybersecurity #IoT #TapoC520WS

⚠️ **Vulnerability Alert:** TP-Link Tapo C520WS — multiple adjacent-network vulnerabilities (DoS, crash, authentication bypass) 📅 **Timeline:** Disclosure: 2026-04-02; Patch: firmware available (see fixed versions) 🆔 **CVE-2026-34121** | 📊 CVSS: 8.7 (HIGH 🟠) | 📈 EPSS: Not Available% 🆔 **CVE-2026-34118** | 📊 CVSS: 7.1 (HIGH 🟠) | 📈 EPSS: Not Available% 🆔 **CVE-2026-34119** | 📊 CVSS: 7.1 (HIGH 🟠) | 📈 EPSS: Not Available% 🆔 **CVE-2026-34120** | 📊 CVSS: 7.1 (HIGH 🟠) | 📈 EPSS: Not Available% 🆔 **CVE-2026-34122** | 📊 CVSS: 7.1 (HIGH 🟠) | 📈 EPSS: Not Available% 🆔 **CVE-2026-34124** | 📊 CVSS: 7.1 (HIGH 🟠) | 📈 EPSS: Not Available% 🛠️ **Exploit Maturity:** Not Available 📂 **Affected Versions:** TP-Link Tapo C520WS v2.6 (firmware before 1.2.4 Build 260326 Rel.24666n) 🔧 **Fixed Versions:** 1.2.4 Build 260326 Rel.24666n 🫨 **Attack Vectors:** - Adjacent network (local/Wi‑Fi) - HTTP DS configuration service (authentication bypass) - Malformed HTTP POST / segmented requests (heap overflows) - Asynchronous video stream input (heap overflow) - HTTP request path normalization (path-expansion overflow) 📝 **Summary:** Unauthenticated attackers on the same network can crash or reboot Tapo C520WS devices (multiple heap/stack overflows) and CVE-2026-34121 enables an authentication bypass that permits unauthorized configuration changes and potential access to device functions/streams. These flaws create immediate physical security and privacy risks for camera deployments. 📈 **Impact Scope:** Unauthenticated local attackers can cause Denial-of-Service (device crash/reboot) and, via auth bypass, make privileged configuration changes or access device functionality, creating security blind spots. 🛡️ **Recommended Actions:** - Immediately update devices to firmware 1.2.4 Build 260326 Rel.24666n (verify installed version) - Segment cameras on a VLAN and restrict Wi‑Fi access; disable unnecessary remote management/port-forwarding - Monitor device availability and logs for crashes or unexpected config changes; reinstall firmware if integrity is suspect - Contact TP-Link support and follow vendor guidance 🪢 **Related Resources:** - https://www.youtube.com/watch?v=KsZ6tROaVOQ - https://en.wikipedia.org/wiki/2 🏷 **Tags:** #Cybersecurity #TPLink #TapoC520WS